DWARF_GET_STR(3)

✨ NAME ✨

Okay bestie, this is DWARF_GET_STR(3) from the Library Functions Manual, and it is so ready to help.

dwarf_get_str — retrieve a string from the DWARF string section.

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📚 LIBRARY 📚

This one lives in the DWARF Access Library (libdwarf, -ldwarf). Iykyk. 🦋

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🛠️ SYNOPSIS 🛠️

#include <libdwarf.h>

int
dwarf_get_str(Dwarf_Debug dbg, Dwarf_Off offset, char **string,
    Dwarf_Signed *len, Dwarf_Error *err);

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💖 DESCRIPTION 💖

Function dwarf_get_str() retrieves a NUL-terminated string from the DWARF string section .debug_str. It's giving “string section bestie, let's go”. ✨

Here's the cast of arguments, no cap:

• Argument dbg should reference a DWARF debug context allocated using dwarf_init(3).
• Argument offset should be an offset, relative to the .debug_str section, specifying the start of the desired string.
• Argument string should point to a location which will hold a returned pointer to a NUL-terminated string.
• Argument len should point to a location which will hold the length of the returned string. The returned length does not include the space needed for the NUL-terminator. Important detail, bestie. 🎀
• If argument err is not NULL, it will be used to store error information in case of an error.

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🎀 RETURN VALUES 🎀

Vibe check on the return values:

• DW_DLV_OK — function dwarf_get_str() returns this when it succeeds. Slay. ✅
• DW_DLV_NO_ENTRY — it returns this if there is no .debug_str section associated with the specified debugging context, or if the provided offset is at the very end of the .debug_str section. No string, no entry, periodt. 💅
• DW_DLV_ERROR — in case of an error, it returns this and sets the argument err. 😭

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🌸 EXAMPLES 🌸

To retrieve all the strings in the DWARF string section, use this loop, bestie:

Dwarf_Debug dbg;
Dwarf_Off offset;
Dwarf_Signed len;
Dwarf_Error de;
char *str;
int ret

offset = 0;
while ((ret = dwarf_get_str(dbg, offset, &str, &len, &de)) ==
        DW_DLV_OK) {
        /* .. Use the retrieved string. .. */
        offset += len + 1; /* Account for the terminating NUL. */
}

if (ret == DW_DLV_ERROR)
        warnx("dwarf_get_str: %s", dwarf_errmsg(de));

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💀 ERRORS 💀

Function dwarf_get_str() can fail with:

• [DW_DLE_ARGUMENT] — one of the arguments dbg, string or len was NULL.
• [DW_DLE_ARGUMENT] — argument offset was out of range.
• [DW_DLE_NO_ENTRY] — the debugging context dbg did not contain a .debug_str string section.
• [DW_DLE_NO_ENTRY] — argument offset was at the very end of the .debug_str section.

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🔗 SEE ALSO 🔗

Go hang with dwarf(3) and dwarf_init(3). They're the supporting cast, and they understood the assignment. 🫶

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Okay that's the whole page, bestie. This one is from Debian, dated April 3, 2011 — DWARF_GET_STR(3) signing off. 💅✨